Process of preparing black plate.



L; Lz'PPMANNg PROCESS OF'PREPARING BLACK PLATEl 'APPucATxoNTlLEn DCT. 6, :1913.

Specllcetion of'Letters ate'at.

' Patented Margo., llll Application ie october e, i913.. Serial its. io

T 0 aZZ whom it may' concern ,f

.Be itknown that l, Liso. Lirrxrrimi, a soloject of the Emperor oi' Germany, and resident of Berlin, Germany, have invented certain new ancl usefulI Improvements in Proc- 'nislies waxes. pastes. carbid, food products,

etc.n areusuallyv `emited with a coloring or var isli and printed with text or 'other mat@ ter on one sicle, while *thel interior side of the receptacleis `not so coated. y

la the eniplo}-ient oi sheet iron in the forni oi' socallef black plate as found on'ihe marketaiicl especialljY 'when the print-ing is (lone .on high speed presses, it is iouncl that the ink does Quot properly adhere ami often sinudges ancl is also liable to crack and fall mi' after it dries. The. reason for this is that the surface' otlie metal is sinootliliv polis ie in coosequeiice of the colei-rolling process to which it is subjected in its manufact-ure. For example, in the' manufacture of sheet. metal canisters 'foi-.metal polish, blacliing, ariel the like, the color is often rubbed oil in the starapiiie operation, so that the articles have to he gorie over by bami with brushes, ariel col rs before they besent out. @n the other liaml; the employment of uoircolcl rollecl or iiiipolislieil metal will lie ilisaeliaib tegeous because the metal would be uneven, undulating or Wrinliierl, since it is stretched, and, therefore, cannot loe usecl with advantage for the manufacture of arti cles such as above inolicatecl. Moreover, the noo-colei rolled metal lof: reason oli loot being stretched, cornes in smaller sheets, ariel, therefore, its employment is coniparatiiel uneconon'iical, Also the presence oli a roug face iii the interior of boxes or l costei i'oiitagfeous lo reason of the arllierem-. o

oli surface.;

the substance to tl According to t e p f invent-ion, a plate of black sheet. iioii or steel is eiiipioji'eii which is polislieil or coltlrolleci apoi'i one sicle as former-lf, whereas the other siiie that. is used for coating and priiii'iiig is left rough. lo, this Way, the alr-sioie volf the other articlespastjf substances is rsad--' fris vpainter lacquer to the exterior of, the article 1s secured, While the interior surface which' is contacted by the pasty material ,contained in the receptacle4 is smooth ond oers no pores or recesses into which the pasty material can lodge and thus adhere to the interi-or of the receptacle. tloreove'r,y by reason of the cold-rolling of the sheehiron or steel on one side, the saine is stretched and istlius free of the unereimess above 'mentioiied. a 'i ln the accompanying drawing illustrating this invention, 4l `igure l 'is an elevation partly broken away of a canisterv .made from the improved metal.' Fig. 2 is a 'plan `view :of one side and Fig. 3 is a plan view of the other sicle of a plate or the iiiiproreiill black sheet iron or steel.

Ref rring particularly to Figs. Q-and 3, the impr-ered sheet iron, plate is provided at one side l() with a smooth surfacepioduce preferably by colei-rolling :intl the other side 1l is left rouglias the sheet emerges from.

the hot rolliogproces. 'This may be 0btainecl by; putting the plates through the rolls 'two a time, so that the. outside 'faces of the plates are 'colei-reliez?. or polished7 4While the irisiole faces remain unpolishedwith the usualcoa aiiig oi ,oxicl This method ispreferable is the rolling pressureto which the iiisicle suroces of the plates are thus subjects-cl has eect oisoinewliat flattening the groores ariel closing; ille pores. so that the rough surface will alisoro a smaller quantity of the coating. Another inetlioil may lie'. resorted to ior oiitainino los result- Wliiclicorisists iii- Wieliiig one of ythe rolls with a. rough sur ace. as tor e; imple.. oy applying a coatingoi" facing" thereon, the rough in a- 'e el thus making `this roll serre as e stretching roller snol not as a colmolling or polishing roll. Another method consists in lioaslieet upon aftable above wh "n a. colti-rolling or polishing roll is meunier.. ...lislie sheet and table more rela tively to the roller. tliefface adjacent to the roll will alone be polished, ,Whereastlie amici face not exposed. to the-roll remains rough.

lollig have illustrate@ a canister meile oi the impl-overl sheet metal hating ai' rough exterior surface lil and a polished in terior surface l5.- "llie exteriorsurface is cor-ezeiil bj: a coating; il which is 'printed with l iteriiigf lr` This coating anti printing will l"to the outer si1radhere ver):- tiring tace or' the receptace o3' reason. of the rough-- ies jness ofthe surface to which they are applied. On the other hand, the interior sur- -face which is contacted by the 'contents of the canister is' smooth and polished, consti# tut-lng a surface to which past;7 or other ad- -l hesive substances will not readily adl1ere.

Having thus described my invention, I clalm as new and desire to secure by Letters Patent:

l. The process of preparing black plaieof oXid thereon, and applyingthe coating to .the unpolished side.

"I5-f2 l' L 1,176,912'

2. The process of preparing black plate for the manu/facture of receptacles thereof the plate only, lea\'in, the other side unpolished with a coat of oxid thereon and applying the coating to the unpolished side, 25 'and printing the desired characters on the coating.

Signed at Berlin, in the countiv of Brandenburg and State of Germany, this 11th day of September, A. D. 1913. LEO LIPPMANN.

-Witnesses WOLDEMAR HAUPT, HENRY HA'SPER. 

